Abstract
This chapter reviews recent progress in the study of optical non-linearities in widegap II–VI semiconductors for applications in optical bistability and all-optical circuits. Semiconductors make appropriate materials for developing digital optical elements because of the existence of sensitive non-linear optical responses, the possibilities offered by novel structures and low dimensions, their state of advanced technological development, and compatibility with existing electronics technologies. The first observations of optical bistability in semiconductors in 1978 employing ZnS [1] and widegap II–VI materials have continued to play a major role in the development of this subject [2–6].
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